Year 8 Science · Unit 3 · Lesson 12

Collecting and Interpreting Reaction Data

Challenge Worksheet

Name

Date

Class

Learning Goals

Design a complete data collection plan for a chemical reaction investigation.
Choose appropriate table structure and graph type for specific data.
Develop a strategy for identifying and managing anomalous results.

Go Deeper

Design a mini-experiment

A scientist wants to test: "Does particle size of zinc affect the rate of its reaction with hydrochloric acid (HCl)?" Plan the full data collection investigation below.

What I will change (independent variable)
What I will keep the same (controlled variables — list at least 3)
What I will measure (dependent variable) and how
Design the results table (columns and rows you would use)
Type of graph to use and why (line or bar?)
How I would identify an anomalous result in my data
What I would do if an anomaly were confirmed as real (not a measurement error)

Show What You Know

1. Explain the difference between interpolation and extrapolation when reading a line graph. Give one example of when each would be used in a reaction rate experiment.

Challenge 3 marks

2. A student's data shows a strong correlation: as zinc particle size decreases, reaction rate increases. Explain why this correlation alone does not prove that particle size causes the increase. What additional evidence or reasoning would be needed?

Challenge 3 marks

Wrap Up

In one sentence, what was the main idea of this lesson?